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公开(公告)号：EP1087238B1
公开(公告)日：2004-05-19
申请号：EP00308334.2
申请日：2000-09-22
CPC分类号： G01S7/025 , G01S7/4004 , G01S13/90
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公开(公告)号：EP1087238A2
公开(公告)日：2001-03-28
申请号：EP00308334.2
申请日：2000-09-22
CPC分类号： G01S7/025 , G01S7/4004 , G01S13/90
摘要： Faraday Rotation causes rotation of the plane of polarisation of plane polarised radiation emitted by a radar e.g. a synthetic aperture radar and, if returns polarised in orthogonal planes are measured at the synthetic aperture radar in order to determine polarimetric characteristics of the ground, which could show up features of the ground such as crop patterns, the measurements made at the SAR are contaminated by the Faraday Rotation. In the invention, the transmitted plane polarised beam is pre-rotated in transmitter 9, the radar returns in receiver 13 are mathematically adjusted in signal formatting 14, 15 to compensate for just the pre-rotated angle, to produce data streams on downlink 16 uncontaminated by the Faraday Rotation.
The Faraday Rotation may be estimated by external means 11, 12, or by performing correlation 10 of the orthogonally polarised radar returns to establish a minimum, while the pre-rotation angle and mathematical correction of the returns are being iteratively adjusted, at which Faraday Rotation is assumed to be compensated.摘要翻译： 法拉第旋转引起由雷达发射的平面偏振辐射的偏振平面的旋转，例如 合成孔径雷达，并且如果在合成孔径雷达处测量正交平面中的极化返回，以便确定地面的极化特性，其可以显示诸如作物图案的地面特征，则在SAR处进行的测量被污染 由法拉第旋转。 在本发明中，透射平面偏振光束在发射机9中被预旋转，接收机13中的雷达返回在信号格式化14,15中被数学地调整，以仅补偿预旋转角度，以在下行链路16上产生未受污染的数据流 由法拉第旋转。 法拉第旋转可以通过外部装置11,12估计，或者通过执行正交偏振雷达回波的相关性10来建立最小值，同时反复调整回转角度和数学校正，法拉第旋转 被假定为补偿。
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公开(公告)号：EP1087238A3
公开(公告)日：2002-05-22
申请号：EP00308334.2
申请日：2000-09-22
CPC分类号： G01S7/025 , G01S7/4004 , G01S13/90
摘要： Faraday Rotation causes rotation of the plane of polarisation of plane polarised radiation emitted by a radar e.g. a synthetic aperture radar and, if returns polarised in orthogonal planes are measured at the synthetic aperture radar in order to determine polarimetric characteristics of the ground, which could show up features of the ground such as crop patterns, the measurements made at the SAR are contaminated by the Faraday Rotation. In the invention, the transmitted plane polarised beam is pre-rotated in transmitter 9, the radar returns in receiver 13 are mathematically adjusted in signal formatting 14, 15 to compensate for just the pre-rotated angle, to produce data streams on downlink 16 uncontaminated by the Faraday Rotation. The Faraday Rotation may be estimated by external means 11, 12, or by performing correlation 10 of the orthogonally polarised radar returns to establish a minimum, while the pre-rotation angle and mathematical correction of the returns are being iteratively adjusted, at which Faraday Rotation is assumed to be compensated.
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